In the past few years public relations have become an essential link in every business. Their main role is to communicate the goals and the quality of the organization and gain new and retain existing customers. Public relations have been modernized and adapted to new market trends. An indispensable part of the promotion has become a new platform - the Internet, crucial platform for achieving the competitive advantage. Therefore, it is extremely important for all organizations to develop quality communication on this platform using the tools it offers. New inventions, discoveries, trends and generations require it. This study examined the effectiveness of Web 2.0 communications on the promotion of retail chains. The survey found that retail chains DM, Kaufland, Lidl and Konzum use online tools as a PR technique and that it has a positive effect on their business.